Bug#33727629 Misc fixes for ndb_file on Windows

In ndb_file_win32.cpp do not assume extend function is always called at
beginning of file.  That was true for raw files but not when using
ndbxfrm1 for redo, undo, table space files.

Change-Id: I658d5089eaabde18908b3d5b93977900f59db1c2

Author: zmur

storage/ndb/src/common/portlib/ndb_file_win32.cpp

@@ -240,6 +240,11 @@ ndb_file::off_t ndb_file::get_size() const
 int ndb_file::extend(off_t end, extend_flags flags) const
 {
   require(check_block_size_and_alignment(nullptr, end, end));
+  const off_t saved_file_pos = get_pos();
+  if (saved_file_pos == -1)
+  {
+    return -1;
+  }
   const off_t size = get_size();
   if (size == -1)
   {
@@ -280,7 +285,10 @@ int ndb_file::extend(off_t end, extend_flags flags) const
       SetLastError(0);
     }
   }
-  set_pos(0);
+  if (set_pos(saved_file_pos) == -1)
+  {
+    return -1;
+  }
   return 0;
 }